From 2015 to 2020, the annual mean radiation in the Yangtze River Delta showed an increasing trend at first, followed by a decreasing trend later, peaking in 2018 and then decreasing by 8.92% in 2020 compared to 2019.
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From 2015 to 2020, the annual mean radiation in the Yangtze River Delta showed an increasing trend at first, followed by a decreasing trend later, peaking in 2018 and then decreasing by 8.92% in 2020 compared to 2019.